化能自养型硫杆菌脱硫机制及脱硫策略

介绍了对化能自养型硫杆菌氧化煤中黄铁矿硫机制的认识过程,讨论了黄铁矿生物氧化机制的新观点:主要包括黄铁矿生物氧化的电化学本质、黄铁矿表面吸附细菌的功能、黄铁矿生物氧化的具体反应途径。采用氧化还原电势或[Fe3+]/[Fe2+]比建立的速率方程可用于描述化能自养型硫杆菌的生物氧化过程,其中中间产物元素硫的进一步氧化可能是限速步骤。针对目前黄铁矿生物氧化机制的新认识,提出了提高煤系黄铁矿硫生物脱除效率的研究策略。此外,如研究证实元素硫为超高硫煤中有机相硫的一部分,化能自养型硫杆菌也将能用于脱除煤中该部分有机硫。

Mechanism and strategy of biodesulfurization by chemoautotrophic Thiobacillus

Developments in mechanisms of oxidation of coal pyrite by chemoautotrophic Thiobacillus are introduced.New insights in mechanisms of biooxidation of pyrite are discussed,which comprise the electrochemical reaction basis of biooxidation process,the functions of attached bacteria on pyrite,detailed pathway of biooxidation of pyrite.Rate equations based on redox potential or ferric/ferrous-iron ratio are used to describe the processes of biooxidation of pyrite in which oxidation of elemental sulphur generated controlled the total reaction process.Furthermore,if it is substantiated that element sulphur exists in organic sulphur of coal,chemoautotrophic Thiobacillus will be used to remove the fraction of organic sulphur in coal.